﻿#region

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;

#endregion

namespace Utils.DB.OleDb
{
    /// <summary>
    ///   The SqlHelper class is intended to encapsulate high performance, scalable best practices for 
    ///   common uses of SqlClient
    /// </summary>
    public static class SqlHelper
    {
        //
        //
        private const int OleDbCommandSecondTimeOut = 600;

        #region private utility methods & constructors

        // Since this class provides only static methods, make the default constructor private to prevent 
        // instances from being created with "new SqlHelper()"

        /// <summary>
        ///   This method is used to attach array of OleDbParameters to a OleDbCommand.
        /// 
        ///   This method will assign a value of DbNull to any parameter with a direction of
        ///   InputOutput and a value of null.  
        /// 
        ///   This behavior will prevent default values from being used, but
        ///   this will be the less common case than an intended pure output parameter (derived as InputOutput)
        ///   where the user provided no input value.
        /// </summary>
        /// <param name="command"> The command to which the parameters will be added </param>
        /// <param name="commandParameters"> An array of OleDbParameters to be added to command </param>
        private static void AttachParameters(OleDbCommand command, IEnumerable<OleDbParameter> commandParameters)
        {
            if (command == null)
                throw new ArgumentNullException("command");
            if (commandParameters != null)

                foreach (var p in commandParameters)
                    if (p != null)
                    {
                        // Check for derived output value with no value assigned
                        if ((p.Direction == ParameterDirection.InputOutput ||
                             p.Direction == ParameterDirection.Input) &&
                            (p.Value == null))
                            p.Value = DBNull.Value;
                        command.Parameters.Add(p);
                    }
        }

        /// <summary>
        ///   This method assigns dataRow column values to an array of OleDbParameters
        /// </summary>
        /// <param name="commandParameters"> Array of OleDbParameters to be assigned values </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values </param>
        private static void AssignParameterValues(IEnumerable<OleDbParameter> commandParameters, DataRow dataRow)
        {
            if ((commandParameters == null) || (dataRow == null))
                // Do nothing if we get no data
                return;

            var i = 0;
            // Set the parameters values
            foreach (var commandParameter in commandParameters)
            {
                // Check the parameter name
                if (commandParameter.ParameterName == null ||
                    commandParameter.ParameterName.Length <= 1)
                    throw new Exception(
                        string.Format(
                            "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
                            i, commandParameter.ParameterName));
                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
                i++;
            }
        }

        /// <summary>
        ///   This method assigns an array of values to an array of OleDbParameters
        /// </summary>
        /// <param name="commandParameters"> Array of OleDbParameters to be assigned values </param>
        /// <param name="parameterValues"> Array of objects holding the values to be assigned </param>
        private static void AssignParameterValues(IList<OleDbParameter> commandParameters,
            IList<object> parameterValues)
        {
            if ((commandParameters == null) || (parameterValues == null))
                // Do nothing if we get no data
                return;

            // We must have the same number of values as we pave parameters to put them in
            if (commandParameters.Count != parameterValues.Count)
                throw new ArgumentException("Parameter count does not match Parameter Value count.");

            // Iterate through the OleDbParameters, assigning the values from the corresponding position in the 
            // value array
            var j = commandParameters.Count;
            for (var i = 0; i < j; i++)
                // If the current array value derives from IDbDataParameter, then assign its Value property
                if (parameterValues[i] is IDbDataParameter)
                {
                    var paramInstance = (IDbDataParameter) parameterValues[i];
                    commandParameters[i].Value = paramInstance.Value ?? DBNull.Value;
                }
                else if (parameterValues[i] == null)
                    commandParameters[i].Value = DBNull.Value;
                else
                    commandParameters[i].Value = parameterValues[i];
        }

        /// <summary>
        ///   This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
        ///   to the provided command
        /// </summary>
        /// <param name="command"> The OleDbCommand to be prepared </param>
        /// <param name="connection"> A valid OleDbConnection, on which to execute this command </param>
        /// <param name="transaction"> A valid OleDbTransaction, or 'null' </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of OleDbParameters to be associated with the command or 'null' if no parameters are required </param>
        /// <param name="mustCloseConnection"> <c>true</c> if the connection was opened by the method, otherwose is false. </param>
        private static void PrepareCommand(OleDbCommand command, OleDbConnection connection,
            OleDbTransaction transaction,
            CommandType commandType, string commandText,
            IEnumerable<OleDbParameter> commandParameters,
            out bool mustCloseConnection)
        {
            if (command == null)
                throw new ArgumentNullException("command");
            if (string.IsNullOrEmpty(commandText))
                throw new ArgumentNullException("commandText");

            // If the provided connection is not open, we will open it
            if (connection.State != ConnectionState.Open)
            {
                mustCloseConnection = true;
                connection.Open();
            }
            else
                mustCloseConnection = false;

            // Associate the connection with the command
            command.Connection = connection;

            // Set the command text (stored procedure name or SQL statement)
            command.CommandText = commandText;

            command.CommandTimeout = OleDbCommandSecondTimeOut;

            // If we were provided a transaction, assign it
            if (transaction != null)
            {
                if (transaction.Connection == null)
                    throw new ArgumentException(
                        "The transaction was rollbacked or commited, please provide an open transaction.",
                        "transaction");
                command.Transaction = transaction;
            }

            // Set the command type
            command.CommandType = commandType;

            // Attach the command parameters if they are provided
            if (commandParameters != null)
                AttachParameters(command, commandParameters);
        }

        #endregion private utility methods & constructors

        #region ExecuteNonQuery

        /// <summary>
        ///   Execute a OleDbCommand (that returns no resultset and takes no parameters) against the database specified in 
        ///   the connection string
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteNonQuery(connectionString, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns no resultset) against the database specified in the connection string 
        ///   using the provided parameters
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");

            // Create & open a OleDbConnection, and dispose of it after we are done
            using (var connection = new OleDbConnection(connectionString))
            {
                connection.Open();

                // Call the overload that takes a connection in place of the connection string
                return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns no resultset) against the database specified in 
        ///   the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored prcedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns no resultset and takes no parameters) against the provided OleDbConnection.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(OleDbConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteNonQuery(connection, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns no resultset) against the specified OleDbConnection 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(OleDbConnection connection, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");

            // Create a command and prepare it for execution
            var cmd = new OleDbCommand();
            bool mustCloseConnection;
            PrepareCommand(cmd, connection, null, commandType, commandText, commandParameters,
                out mustCloseConnection);

            // Finally, execute the command
            var retval = cmd.ExecuteNonQuery();

            // Detach the OleDbParameters from the command object, so they can be used again
            cmd.Parameters.Clear();
            if (mustCloseConnection)
                connection.Close();
            return retval;
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns no resultset) against the specified OleDbConnection 
        ///   using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(OleDbConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns no resultset and takes no parameters) against the provided OleDbTransaction.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(OleDbTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteNonQuery(transaction, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns no resultset) against the specified OleDbTransaction
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(OleDbTransaction transaction, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // Create a command and prepare it for execution
            var cmd = new OleDbCommand();
            bool mustCloseConnection;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters,
                out mustCloseConnection);

            // Finally, execute the command
            var retval = cmd.ExecuteNonQuery();

            // Detach the OleDbParameters from the command object, so they can be used again
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns no resultset) against the specified 
        ///   OleDbTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQuery(OleDbTransaction transaction, string spName, params object[] parameterValues)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
        }

        #endregion ExecuteNonQuery

        #region ExecuteDataSet

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the database specified in 
        ///   the connection string.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteDataSet(connectionString, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the database specified in the connection string 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(connString, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(string connectionString, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");

            // Create & open a OleDbConnection, and dispose of it after we are done
            using (var connection = new OleDbConnection(connectionString))
            {
                connection.Open();

                // Call the overload that takes a connection in place of the connection string
                return ExecuteDataSet(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the database specified in 
        ///   the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(connString, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(string connectionString, string spName, params object[] parameterValues)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteDataSet(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteDataSet(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbConnection.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(OleDbConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteDataSet(connection, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(conn, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(OleDbConnection connection, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");

            // Create a command and prepare it for execution
            var cmd = new OleDbCommand();
            bool mustCloseConnection;
            PrepareCommand(cmd, connection, null, commandType, commandText, commandParameters,
                out mustCloseConnection);

            // Create the DataAdapter & DataSet
            using (var da = new OleDbDataAdapter(cmd))
            {
                var ds = new DataSet();

                // Fill the DataSet using default values for DataTable names, etc
                da.Fill(ds);

                // Detach the OleDbParameters from the command object, so they can be used again
                cmd.Parameters.Clear();

                if (mustCloseConnection)
                    connection.Close();

                // Return the dataset
                return ds;
            }
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(OleDbConnection connection, string spName,
            params object[] parameterValues)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteDataSet(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteDataSet(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbTransaction.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(OleDbTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteDataSet(transaction, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbTransaction
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(trans, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(OleDbTransaction transaction, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // Create a command and prepare it for execution
            var cmd = new OleDbCommand();
            bool mustCloseConnection;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters,
                out mustCloseConnection);

            // Create the DataAdapter & DataSet
            using (var da = new OleDbDataAdapter(cmd))
            {
                var ds = new DataSet();

                // Fill the DataSet using default values for DataTable names, etc
                da.Fill(ds);

                // Detach the OleDbParameters from the command object, so they can be used again
                cmd.Parameters.Clear();

                // Return the dataset
                return ds;
            }
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified 
        ///   OleDbTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSet(OleDbTransaction transaction, string spName,
            params object[] parameterValues)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteDataSet(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteDataSet(transaction, CommandType.StoredProcedure, spName);
        }

        #endregion ExecuteDataSet

        #region ExecuteDataTable

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the database specified in 
        ///   the connection string.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType,
            string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            var dataset = ExecuteDataSet(connectionString, commandType, commandText);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the database specified in the connection string 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(connString, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType,
            string commandText,
            params OleDbParameter[] commandParameters)
        {
            var dataset = ExecuteDataSet(connectionString, commandType, commandText, commandParameters);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the database specified in 
        ///   the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(connString, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(string connectionString, string spName,
            params object[] parameterValues)
        {
            var dataset = ExecuteDataSet(connectionString, spName, parameterValues);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbConnection.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(OleDbConnection connection, CommandType commandType,
            string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            var dataset = ExecuteDataSet(connection, commandType, commandText);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(conn, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(OleDbConnection connection, CommandType commandType,
            string commandText,
            params OleDbParameter[] commandParameters)
        {
            var dataset = ExecuteDataSet(connection, commandType, commandText, commandParameters);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(OleDbConnection connection, string spName,
            params object[] parameterValues)
        {
            var dataset = ExecuteDataSet(connection, spName, parameterValues);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbTransaction.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(OleDbTransaction transaction, CommandType commandType,
            string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            var dataset = ExecuteDataSet(transaction, commandType, commandText);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbTransaction
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(trans, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(OleDbTransaction transaction, CommandType commandType,
            string commandText,
            params OleDbParameter[] commandParameters)
        {
            var dataset = ExecuteDataSet(transaction, commandType, commandText, commandParameters);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified 
        ///   OleDbTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   DataSet ds = ExecuteDataSet(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataTable ExecuteDataTable(OleDbTransaction transaction, string spName,
            params object[] parameterValues)
        {
            var dataset = ExecuteDataSet(transaction, spName, parameterValues);
            if (dataset == null || dataset.Tables.Count == 0)
                return null;
            return dataset.Tables[0];
        }

        #endregion ExecuteDataSet

        #region ExecuteReader

        /// <summary>
        ///   Create and prepare a OleDbCommand, and call ExecuteReader with the appropriate CommandBehavior.
        /// </summary>
        /// <remarks>
        ///   If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
        /// 
        ///   If the caller provided the connection, we want to leave it to them to manage.
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection, on which to execute this command </param>
        /// <param name="transaction"> A valid OleDbTransaction, or 'null' </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of OleDbParameters to be associated with the command or 'null' if no parameters are required </param>
        /// <param name="connectionOwnership"> Indicates whether the connection parameter was provided by the caller, or created by SqlHelper </param>
        /// <returns> OleDbDataReader containing the results of the command </returns>
        private static OleDbDataReader ExecuteReader(OleDbConnection connection, OleDbTransaction transaction,
            CommandType commandType, string commandText,
            IEnumerable<OleDbParameter> commandParameters,
            OleDbConnectionOwnership connectionOwnership)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");

            var mustCloseConnection = false;
            // Create a command and prepare it for execution
            var cmd = new OleDbCommand();
            try
            {
                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters,
                    out mustCloseConnection);

                // Create a reader

                // Call ExecuteReader with the appropriate CommandBehavior
                var dataReader = connectionOwnership == OleDbConnectionOwnership.External
                    ? cmd.ExecuteReader()
                    : cmd.ExecuteReader(CommandBehavior.CloseConnection);

                // Detach the OleDbParameters from the command object, so they can be used again.
                // HACK: There is a problem here, the output parameter values are fletched 
                // when the reader is closed, so if the parameters are detached from the command
                // then the SqlReader can磘 set its values. 
                // When this happen, the parameters can磘 be used again in other command.
                var canClear = true;
                foreach (OleDbParameter commandParameter in cmd.Parameters)
                    if (commandParameter.Direction != ParameterDirection.Input)
                        canClear = false;

                if (canClear)
                    cmd.Parameters.Clear();

                return dataReader;
            }
            catch
            {
                if (mustCloseConnection)
                    connection.Close();
                throw;
            }
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the database specified in 
        ///   the connection string.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(string connectionString, CommandType commandType,
            string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteReader(connectionString, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the database specified in the connection string 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(string connectionString, CommandType commandType,
            string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            OleDbConnection connection = null;
            try
            {
                connection = new OleDbConnection(connectionString);
                connection.Open();

                // Call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(connection, null, commandType, commandText, commandParameters,
                    OleDbConnectionOwnership.Internal);
            }
            catch
            {
                // If we fail to return the SqlDatReader, we need to close the connection ourselves
                if (connection != null)
                    connection.Close();
                throw;
            }
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the database specified in 
        ///   the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(string connectionString, string spName,
            params object[] parameterValues)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbConnection.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(OleDbConnection connection, CommandType commandType,
            string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteReader(connection, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(OleDbConnection connection, CommandType commandType,
            string commandText,
            params OleDbParameter[] commandParameters)
        {
            // Pass through the call to the private overload using a null transaction value and an externally owned connection
            return ExecuteReader(connection, null, commandType, commandText, commandParameters,
                OleDbConnectionOwnership.External);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(OleDbConnection connection, string spName,
            params object[] parameterValues)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (
                string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteReader(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbTransaction.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(OleDbTransaction transaction, CommandType commandType,
            string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteReader(transaction, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbTransaction
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(OleDbTransaction transaction, CommandType commandType,
            string commandText, params OleDbParameter[] commandParameters)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // Pass through to private overload, indicating that the connection is owned by the caller
            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters,
                OleDbConnectionOwnership.External);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified
        ///   OleDbTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   OleDbDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReader(OleDbTransaction transaction, string spName,
            params object[] parameterValues)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
        ///   we can set the appropriate CommandBehavior when calling ExecuteReader()
        /// </summary>
        private enum OleDbConnectionOwnership
        {
            /// <summary>
            ///   Connection is owned and managed by SqlHelper
            /// </summary>
            Internal,

            /// <summary>
            ///   Connection is owned and managed by the caller
            /// </summary>
            External
        }

        #endregion ExecuteReader

        #region ExecuteScalar

        /// <summary>
        ///   Execute a OleDbCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
        ///   the connection string.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteScalar(connectionString, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a 1x1 resultset) against the database specified in the connection string 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            // Create & open a OleDbConnection, and dispose of it after we are done
            using (var connection = new OleDbConnection(connectionString))
            {
                connection.Open();

                // Call the overload that takes a connection in place of the connection string
                return ExecuteScalar(connection, commandType, commandText, commandParameters);
            }
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a 1x1 resultset) against the database specified in 
        ///   the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a 1x1 resultset and takes no parameters) against the provided OleDbConnection.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(OleDbConnection connection, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteScalar(connection, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a 1x1 resultset) against the specified OleDbConnection 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(OleDbConnection connection, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");

            // Create a command and prepare it for execution
            var cmd = new OleDbCommand();

            bool mustCloseConnection;
            PrepareCommand(cmd, connection, null, commandType, commandText, commandParameters,
                out mustCloseConnection);

            // Execute the command & return the results
            var retval = cmd.ExecuteScalar();

            // Detach the OleDbParameters from the command object, so they can be used again
            cmd.Parameters.Clear();

            if (mustCloseConnection)
                connection.Close();

            return retval;
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a 1x1 resultset) against the specified OleDbConnection 
        ///   using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(OleDbConnection connection, string spName, params object[] parameterValues)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a 1x1 resultset and takes no parameters) against the provided OleDbTransaction.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(OleDbTransaction transaction, CommandType commandType, string commandText)
        {
            // Pass through the call providing null for the set of OleDbParameters
            return ExecuteScalar(transaction, commandType, commandText, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a 1x1 resultset) against the specified OleDbTransaction
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(OleDbTransaction transaction, CommandType commandType, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

            // Create a command and prepare it for execution
            var cmd = new OleDbCommand();
            bool mustCloseConnection;
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters,
                out mustCloseConnection);

            // Execute the command & return the results
            var retval = cmd.ExecuteScalar();

            // Detach the OleDbParameters from the command object, so they can be used again
            cmd.Parameters.Clear();
            return retval;
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a 1x1 resultset) against the specified
        ///   OleDbTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalar(OleDbTransaction transaction, string spName,
            params object[] parameterValues)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
        }

        #endregion ExecuteScalar	

        #region FillDataSet

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the database specified in 
        ///   the connection string.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   FillDataSet(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        public static void FillDataSet(string connectionString, CommandType commandType, string commandText,
            DataSet dataSet, string[] tableNames)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (dataSet == null)
                throw new ArgumentNullException("dataSet");

            // Create & open a OleDbConnection, and dispose of it after we are done
            using (var connection = new OleDbConnection(connectionString))
            {
                connection.Open();

                // Call the overload that takes a connection in place of the connection string
                FillDataSet(connection, commandType, commandText, dataSet, tableNames);
            }
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the database specified in the connection string 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   FillDataSet(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        public static void FillDataSet(string connectionString, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params OleDbParameter[] commandParameters)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (dataSet == null)
                throw new ArgumentNullException("dataSet");
            // Create & open a OleDbConnection, and dispose of it after we are done
            using (var connection = new OleDbConnection(connectionString))
            {
                connection.Open();

                // Call the overload that takes a connection in place of the connection string
                FillDataSet(connection, commandType, commandText, dataSet, tableNames, commandParameters);
            }
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the database specified in 
        ///   the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   FillDataSet(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        public static void FillDataSet(string connectionString, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (dataSet == null)
                throw new ArgumentNullException("dataSet");
            // Create & open a OleDbConnection, and dispose of it after we are done
            using (var connection = new OleDbConnection(connectionString))
            {
                connection.Open();

                // Call the overload that takes a connection in place of the connection string
                FillDataSet(connection, spName, dataSet, tableNames, parameterValues);
            }
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbConnection.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   FillDataSet(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        public static void FillDataSet(OleDbConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames)
        {
            FillDataSet(connection, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   FillDataSet(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        public static void FillDataSet(OleDbConnection connection, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params OleDbParameter[] commandParameters)
        {
            FillDataSet(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   FillDataSet(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        public static void FillDataSet(OleDbConnection connection, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (dataSet == null)
                throw new ArgumentNullException("dataSet");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                FillDataSet(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
                // Otherwise we can just call the SP without params
                FillDataSet(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset and takes no parameters) against the provided OleDbTransaction.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   FillDataSet(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        public static void FillDataSet(OleDbTransaction transaction, CommandType commandType,
            string commandText,
            DataSet dataSet, string[] tableNames)
        {
            FillDataSet(transaction, commandType, commandText, dataSet, tableNames, null);
        }

        /// <summary>
        ///   Execute a OleDbCommand (that returns a resultset) against the specified OleDbTransaction
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   FillDataSet(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        public static void FillDataSet(OleDbTransaction transaction, CommandType commandType,
            string commandText, DataSet dataSet, string[] tableNames,
            params OleDbParameter[] commandParameters)
        {
            FillDataSet(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames,
                commandParameters);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified 
        ///   OleDbTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <remarks>
        ///   This method provides no access to output parameters or the stored procedure's return value parameter.
        /// 
        ///   e.g.:  
        ///   FillDataSet(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
        /// </remarks>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        /// <param name="parameterValues"> An array of objects to be assigned as the input values of the stored procedure </param>
        public static void FillDataSet(OleDbTransaction transaction, string spName,
            DataSet dataSet, string[] tableNames,
            params object[] parameterValues)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (dataSet == null)
                throw new ArgumentNullException("dataSet");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Assign the provided values to these parameters based on parameter order
                AssignParameterValues(commandParameters, parameterValues);

                // Call the overload that takes an array of OleDbParameters
                FillDataSet(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
            }
            else
                // Otherwise we can just call the SP without params
                FillDataSet(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
        }

        /// <summary>
        ///   Private helper method that execute a OleDbCommand (that returns a resultset) against the specified OleDbTransaction and OleDbConnection
        ///   using the provided parameters.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   FillDataSet(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new OleDbParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection </param>
        /// <param name="transaction"> A valid OleDbTransaction </param>
        /// <param name="commandType"> The CommandType (stored procedure, text, etc.) </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="dataSet"> A dataset wich will contain the resultset generated by the command </param>
        /// <param name="tableNames"> This array will be used to create table mappings allowing the DataTables to be referenced by a user defined name (probably the actual table name) </param>
        /// <param name="commandParameters"> An array of SqlParamters used to execute the command </param>
        private static void FillDataSet(OleDbConnection connection, OleDbTransaction transaction,
            CommandType commandType,
            string commandText, DataSet dataSet, IList<string> tableNames,
            params OleDbParameter[] commandParameters)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (dataSet == null)
                throw new ArgumentNullException("dataSet");

            // Create a command and prepare it for execution
            var command = new OleDbCommand();
            bool mustCloseConnection;
            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters,
                out mustCloseConnection);

            // Create the DataAdapter & DataSet
            using (var dataAdapter = new OleDbDataAdapter(command))
            {
                // Add the table mappings specified by the user
                if (tableNames != null && tableNames.Count > 0)
                {
                    var tableName = "Table";
                    for (var index = 0; index < tableNames.Count; index++)
                    {
                        if (tableNames[index] == null || tableNames[index].Length == 0)
                            throw new ArgumentException(
                                "The tableNames parameter must contain a list of tables, a value was provided as null or empty string.",
                                "tableNames");
                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);
                        tableName += (index + 1).ToString();
                    }
                }

                // Fill the DataSet using default values for DataTable names, etc
                dataAdapter.Fill(dataSet);

                // Detach the OleDbParameters from the command object, so they can be used again
                command.Parameters.Clear();
            }

            if (mustCloseConnection)
                connection.Close();
        }

        #endregion

        #region UpdateDataSet

        /// <summary>
        ///   Executes the respective command for each inserted, updated, or deleted row in the DataSet.
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   UpdateDataSet(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
        /// </remarks>
        /// <param name="insertCommand"> A valid transact-SQL statement or stored procedure to insert new records into the data source </param>
        /// <param name="deleteCommand"> A valid transact-SQL statement or stored procedure to delete records from the data source </param>
        /// <param name="updateCommand"> A valid transact-SQL statement or stored procedure used to update records in the data source </param>
        /// <param name="dataSet"> The DataSet used to update the data source </param>
        /// <param name="tableName"> The DataTable used to update the data source. </param>
        public static void UpdateDataSet(OleDbCommand insertCommand, OleDbCommand deleteCommand,
            OleDbCommand updateCommand,
            DataSet dataSet, string tableName)
        {
            if (insertCommand == null)
                throw new ArgumentNullException("insertCommand");
            if (deleteCommand == null)
                throw new ArgumentNullException("deleteCommand");
            if (updateCommand == null)
                throw new ArgumentNullException("updateCommand");
            if (string.IsNullOrEmpty(tableName))
                throw new ArgumentNullException("tableName");

            // Create a OleDbDataAdapter, and dispose of it after we are done
            using (var dataAdapter = new OleDbDataAdapter())
            {
                // Set the data adapter commands
                dataAdapter.UpdateCommand = updateCommand;
                dataAdapter.InsertCommand = insertCommand;
                dataAdapter.DeleteCommand = deleteCommand;

                // Update the dataset changes in the data source
                dataAdapter.Update(dataSet, tableName);

                // Commit all the changes made to the DataSet
                dataSet.AcceptChanges();
            }
        }

        #endregion

        #region CreateCommand

        /// <summary>
        ///   Simplify the creation of a Sql command object by allowing
        ///   a stored procedure and optional parameters to be provided
        /// </summary>
        /// <remarks>
        ///   e.g.:  
        ///   OleDbCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="sourceColumns"> An array of string to be assigned as the source columns of the stored procedure parameters </param>
        /// <returns> A valid OleDbCommand object </returns>
        public static OleDbCommand CreateCommand(OleDbConnection connection, string spName,
            params string[] sourceColumns)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // Create a OleDbCommand
            var cmd = new OleDbCommand(spName, connection)
            {
                CommandType = CommandType.StoredProcedure
            };

            // If we receive parameter values, we need to figure out where they go
            if ((sourceColumns != null) && (sourceColumns.Length > 0))
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Assign the provided source columns to these parameters based on parameter order
                for (var index = 0; index < sourceColumns.Length; index++)
                    commandParameters[index].SourceColumn = sourceColumns[index];

                // Attach the discovered parameters to the OleDbCommand object
                AttachParameters(cmd, commandParameters);
            }

            return cmd;
        }

        #endregion

        #region ExecuteNonQueryTypedParams

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns no resultset) against the database specified in 
        ///   the connection string using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns no resultset) against the specified OleDbConnection 
        ///   using the dataRow column values as the stored procedure's parameters values.  
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQueryTypedParams(OleDbConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns no resultset) against the specified
        ///   OleDbTransaction using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="transaction"> A valid OleDbTransaction object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> An int representing the number of rows affected by the command </returns>
        public static int ExecuteNonQueryTypedParams(OleDbTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // Sf the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
        }

        #endregion

        #region ExecuteDataSetTypedParams

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the database specified in 
        ///   the connection string using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSetTypedParams(string connectionString, String spName, DataRow dataRow)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            //If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteDataSet(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteDataSet(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the dataRow column values as the store procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSetTypedParams(OleDbConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteDataSet(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteDataSet(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbTransaction 
        ///   using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on row values.
        /// </summary>
        /// <param name="transaction"> A valid OleDbTransaction object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> A dataset containing the resultset generated by the command </returns>
        public static DataSet ExecuteDataSetTypedParams(OleDbTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteDataSet(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteDataSet(transaction, CommandType.StoredProcedure, spName);
        }

        #endregion

        #region ExecuteReaderTypedParams

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the database specified in 
        ///   the connection string using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbConnection 
        ///   using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReaderTypedParams(OleDbConnection connection, String spName,
            DataRow dataRow)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteReader(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a resultset) against the specified OleDbTransaction 
        ///   using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction"> A valid OleDbTransaction object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> A OleDbDataReader containing the resultset generated by the command </returns>
        public static OleDbDataReader ExecuteReaderTypedParams(OleDbTransaction transaction, String spName,
            DataRow dataRow)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
        }

        #endregion

        #region ExecuteScalarTypedParams

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a 1x1 resultset) against the database specified in 
        ///   the connection string using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSPParameterSet(connectionString,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a 1x1 resultset) against the specified OleDbConnection 
        ///   using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalarTypedParams(OleDbConnection connection, String spName, DataRow dataRow)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(connection, spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
        }

        /// <summary>
        ///   Execute a stored procedure via a OleDbCommand (that returns a 1x1 resultset) against the specified OleDbTransaction
        ///   using the dataRow column values as the stored procedure's parameters values.
        ///   This method will query the database to discover the parameters for the 
        ///   stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
        /// </summary>
        /// <param name="transaction"> A valid OleDbTransaction object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="dataRow"> The dataRow used to hold the stored procedure's parameter values. </param>
        /// <returns> An object containing the value in the 1x1 resultset generated by the command </returns>
        public static object ExecuteScalarTypedParams(OleDbTransaction transaction, String spName, DataRow dataRow)
        {
            if (transaction == null)
                throw new ArgumentNullException("transaction");
            if (transaction != null && transaction.Connection == null)
                throw new ArgumentException(
                    "The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            // If the row has values, the store procedure parameters must be initialized
            if (dataRow != null && dataRow.ItemArray.Length > 0)
            {
                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
                var commandParameters = SqlHelperParameterCacheAccess.GetSpParameterSet(transaction.Connection,
                    spName);

                // Set the parameters values
                AssignParameterValues(commandParameters, dataRow);

                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
        }

        #endregion

        //private static string _OleDbConnection;
    }

    /// <summary>
    ///   SqlHelperParameterCacheAccess provides functions to leverage a static cache of procedure parameters, and the
    ///   ability to discover parameters for stored procedures at run-time.
    /// </summary>
    public static class SqlHelperParameterCacheAccess
    {
        #region private methods, variables, and constructors

        //Since this class provides only static methods, make the default constructor private to prevent 
        //instances from being created with "new SqlHelperParameterCacheAccess()"

        private static readonly Hashtable ParamCache = Hashtable.Synchronized(new Hashtable());

        /// <summary>
        ///   Resolve at run time the appropriate set of OleDbParameters for a stored procedure
        /// </summary>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="includeReturnValueParameter"> Whether or not to include their return value parameter </param>
        /// <returns> The parameter array discovered. </returns>
        private static OleDbParameter[] DiscoverSpParameterSet(OleDbConnection connection, string spName,
            bool includeReturnValueParameter)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            var cmd = new OleDbCommand(spName, connection)
            {
                CommandType = CommandType.StoredProcedure
            };

            connection.Open();
            OleDbCommandBuilder.DeriveParameters(cmd);
            connection.Close();

            if (!includeReturnValueParameter)
                cmd.Parameters.RemoveAt(0);

            var discoveredParameters = new OleDbParameter[cmd.Parameters.Count];

            cmd.Parameters.CopyTo(discoveredParameters, 0);

            // Init the parameters with a DBNull value
            foreach (var discoveredParameter in discoveredParameters)
                discoveredParameter.Value = DBNull.Value;
            return discoveredParameters;
        }

        /// <summary>
        ///   Deep copy of cached OleDbParameter array
        /// </summary>
        /// <param name="originalParameters"> </param>
        /// <returns> </returns>
        private static OleDbParameter[] CloneParameters(IList<OleDbParameter> originalParameters)
        {
            var clonedParameters = new OleDbParameter[originalParameters.Count];

            var j = originalParameters.Count;
            for (var i = 0; i < j; i++)
                clonedParameters[i] = (OleDbParameter) ((ICloneable) originalParameters[i]).Clone();

            return clonedParameters;
        }

        #endregion private methods, variables, and constructors

        #region caching functions

        /// <summary>
        ///   Add parameter array to the cache
        /// </summary>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <param name="commandParameters"> An array of SqlParamters to be cached </param>
        public static void CacheParameterSet(string connectionString, string commandText,
            params OleDbParameter[] commandParameters)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(commandText))
                throw new ArgumentNullException("commandText");

            var hashKey = connectionString + ":" + commandText;

            ParamCache[hashKey] = commandParameters;
        }

        /// <summary>
        ///   Retrieve a parameter array from the cache
        /// </summary>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="commandText"> The stored procedure name or T-SQL command </param>
        /// <returns> An array of SqlParamters </returns>
        public static OleDbParameter[] GetCachedParameterSet(string connectionString, string commandText)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(commandText))
                throw new ArgumentNullException("commandText");

            var hashKey = connectionString + ":" + commandText;

            var cachedParameters = ParamCache[hashKey] as OleDbParameter[];
            return cachedParameters == null
                ? null
                : CloneParameters(cachedParameters);
        }

        #endregion caching functions

        #region Parameter Discovery Functions

        /// <summary>
        ///   Retrieves the set of OleDbParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        ///   This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <returns> An array of OleDbParameters </returns>
        public static OleDbParameter[] GetSPParameterSet(string connectionString, string spName)
        {
            return GetSPParameterSet(connectionString, spName, false);
        }

        /// <summary>
        ///   Retrieves the set of OleDbParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        ///   This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connectionString"> A valid connection string for a OleDbConnection </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="includeReturnValueParameter"> A bool value indicating whether the return value parameter should be included in the results </param>
        /// <returns> An array of OleDbParameters </returns>
        public static OleDbParameter[] GetSPParameterSet(string connectionString, string spName,
            bool includeReturnValueParameter)
        {
            if (string.IsNullOrEmpty(connectionString))
                throw new ArgumentNullException("connectionString");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            using (var connection = new OleDbConnection(connectionString))
                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
        }

        /// <summary>
        ///   Retrieves the set of OleDbParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        ///   This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <returns> An array of OleDbParameters </returns>
        internal static OleDbParameter[] GetSpParameterSet(OleDbConnection connection, string spName)
        {
            return GetSpParameterSet(connection, spName, false);
        }

        /// <summary>
        ///   Retrieves the set of OleDbParameters appropriate for the stored procedure
        /// </summary>
        /// <remarks>
        ///   This method will query the database for this information, and then store it in a cache for future requests.
        /// </remarks>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="includeReturnValueParameter"> A bool value indicating whether the return value parameter should be included in the results </param>
        /// <returns> An array of OleDbParameters </returns>
        internal static OleDbParameter[] GetSpParameterSet(OleDbConnection connection, string spName,
            bool includeReturnValueParameter)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            using (var clonedConnection = (OleDbConnection) ((ICloneable) connection).Clone())
                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
        }

        /// <summary>
        ///   Retrieves the set of OleDbParameters appropriate for the stored procedure
        /// </summary>
        /// <param name="connection"> A valid OleDbConnection object </param>
        /// <param name="spName"> The name of the stored procedure </param>
        /// <param name="includeReturnValueParameter"> A bool value indicating whether the return value parameter should be included in the results </param>
        /// <returns> An array of OleDbParameters </returns>
        private static OleDbParameter[] GetSpParameterSetInternal(OleDbConnection connection, string spName,
            bool includeReturnValueParameter)
        {
            if (connection == null)
                throw new ArgumentNullException("connection");
            if (string.IsNullOrEmpty(spName))
                throw new ArgumentNullException("spName");

            var hashKey = connection.ConnectionString + ":" + spName +
                          (includeReturnValueParameter
                              ? ":include ReturnValue Parameter"
                              : "");

            var cachedParameters = ParamCache[hashKey] as OleDbParameter[];
            if (cachedParameters == null)
            {
                var spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
                ParamCache[hashKey] = spParameters;
                cachedParameters = spParameters;
            }

            return CloneParameters(cachedParameters);
        }

        #endregion Parameter Discovery Functions
    }
}